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Abstract

We theoretically study broadband supercontinuum generation in photonic crystal fibers exhibiting two zero dispersion wavelengths and under continuous-wave pumping. We show that when the pump wavelength is located in between the zero-dispersion wavelengths, a wide and uniform spectral broadening is achieved through modulation instability, generation of both blue-shifted and red-shifted dispersive waves and subsequently through soliton self-frequency shift. This supercontinuum is therefore bounded by these two dispersive waves which allow the control of its bandwidth by a suitable tuning of the fiber dispersion. As a relevant example, we predict that broadband (1050–1600 nm) continuous-wave light can be generated in short lengths of microstructured fibers pumped by use of a 10-W Ytterbium fiber laser.

Note that Fig. 3(e) represents the evolution of the SC spectrum versus the fiber length in logarithm scale. In order to obtain a clear figure, it is plotted from smoothed SC spectra by using the method described in Ref. [29]. One example of this smoothing method is represented in green on Fig. 3(d).

Note that Fig. 3(e) represents the evolution of the SC spectrum versus the fiber length in logarithm scale. In order to obtain a clear figure, it is plotted from smoothed SC spectra by using the method described in Ref. [29]. One example of this smoothing method is represented in green on Fig. 3(d).

(a).-3 (e). Power spectrum for different fiber lengths. The green curve is an averaging of the spectrum by using the smoothing method described in Ref. [29]. (f) Evolution of the power spectrum versus the fiber length from 0 to 20 m in logarithm scale with the average spectra. A movie of the SC dynamics can be viewed by cliquing on Fig. 3. [Media 1]

(a). Center wavelengths of the DW as a function of the pump wavelength for PCF1,2 and 3 in green, blue and red respectively. (b) PSD in PCF1,2 and 3 for L=20 m and P=10 W. Vertical dashed lines represents the second ZDW of each fiber.